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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb4593b27d59609a9e939015e93fd4a326d310a5615bf366e5e365fcd6aa626' 
  AND token = 'yvJILqKIZ1VMFTgLGS/qv+ZrU6qlDMvNo8o6u5L2z/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}